text: /*
   Test utilities.
  
   Copyright (c) 2012-2014, Victor Zverovich
   All rights reserved.
  
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
  
   1. Redistributions of source code must retain the above copyright notice, this
      list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
  
   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
   ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <cstdarg>
  #include <cstdio>
  #include <string>
  
  #include "fmt/posix.h"
  
  enum {BUFFER_SIZE = 256};
  
  #ifdef _MSC_VER
  # define FMT_VSNPRINTF vsprintf_s
  #else
  # define FMT_VSNPRINTF vsnprintf
  #endif
  
  template <std::size_t SIZE>
  void safe_sprintf(char (&buffer)[SIZE], const char *format, ...) {
    std::va_list args;
    va_start(args, format);
    FMT_VSNPRINTF(buffer, SIZE, format, args);
    va_end(args);
  }
  
  // Increment a number in a string.
  void increment(char *s);
  
  std::string get_system_error(int error_code);
  
  extern const char *const FILE_CONTENT;
  
  // Opens a buffered file for reading.
  fmt::BufferedFile open_buffered_file(FILE **fp = 0);
  
  inline FILE *safe_fopen(const char *filename, const char *mode) {
  #if defined(_WIN32) && !defined(__MINGW32__)
    // Fix MSVC warning about "unsafe" fopen.
    FILE *f = 0;
    errno = fopen_s(&f, filename, mode);
    return f;
  #else
    return std::fopen(filename, mode);
  #endif
  }
  
  template <typename Char>
  class BasicTestString {
   private:
    std::basic_string<Char> value_;
  
    static const Char EMPTY[];
  
   public:
    explicit BasicTestString(const Char *value = EMPTY) : value_(value) {}
  
    const std::basic_string<Char> &value() const { return value_; }
  };
  
  template <typename Char>
  const Char BasicTestString<Char>::EMPTY[] = {0};
  
  typedef BasicTestString<char> TestString;
  typedef BasicTestString<wchar_t> TestWString;
  
  template <typename Char>
  std::basic_ostream<Char> &operator<<(
      std::basic_ostream<Char> &os, const BasicTestString<Char> &s) {
    os << s.value();
    return os;
  }
  
  class Date {
    int year_, month_, day_;
   public:
    Date(int year, int month, int day) : year_(year), month_(month), day_(day) {}
  
    int year() const { return year_; }
    int month() const { return month_; }
    int day() const { return day_; }
  };
  